is it possible to concat 2 regular expression strings in javascript [duplicate]

Question

I have 2 regex strings in javascript and I need to concat them into 1 regex. I saw somewhere this could be done using |

example:

passwordRegex:RegExp = '(?=.*[A-Za-z])(?=.*\\d)(?=.*[$@$!%*#?&^])[A-Za-z\\d$@$!%*#?&^]{8,}';
hasFourConsecutiveRegex:RegExp  = '(.)\\1\\1\\1';
combinedRegex:RegExp = new RegExp(this.passwordRegex.source  + ' | ' + this.hasFourConsecutiveRegex.source );

is this how its done?

Have you maybe tried if that's how its done? Wouldn't that answer your question? — Luca Kiebel
– Luca Kiebel, Commented Aug 2, 2018 at 10:11
It depends what your reasons are for concatenating the expressions. What you have done is essentially create an or. Either it matches passwordRegex or (|) it matches hasFourConsecutiveRegex. — phuzi
– phuzi, Commented Aug 2, 2018 at 10:13
What are you trying to do? Validate an 8+ char string that contains at least one ASCII letter, one digit, one special char from the defined set and that has 4 identical consecutive chars? — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Aug 2, 2018 at 11:42

Cryptex Technologies · Accepted Answer · 2018-08-02 10:20:37Z

0

You can do like this:

var passwordRegex = new RegExp('(?=.*[A-Za-z])(?=.*\\d)(?=.*[$@$!%*#?&^])[A-Za-z\\d$@$!%*#?&^]{8,}');
var hasFourConsecutiveRegex = new RegExp('(.)\\1\\1\\1'); 
var combinedRegex = new RegExp(passwordRegex.source   + ' | ' + hasFourConsecutiveRegex.source  );

answered Aug 2, 2018 at 10:20

Cryptex Technologies

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Cryptex Technologies Over a year ago

@TKDev, please accept this answer if it work for you.

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